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A host can simultaneously transmit or receipt multiple packets on different beams with smart antenna (or Multi-beam antenna) systems. Hence, Smart antenna system can have spatial reuse and reduced power consumption. However, the host with smart antenna cannot transmit to its neighboring by one beam and receive from other neighboring by other beam simultaneously. For multi-hop transmissions, an efficient...
In cognitive radio networks, the occupation patterns of the primary users can be very dynamic, which makes optimization (e.g., utility maximization) of data dissemination among secondary users difficult. Even under the assumption that all secondary users are fully collaborative, the optimization requires cross-layer decision making which is challenging. The challenge escalates if users are socially...
For opportunistic networks, we propose a new routing protocol named PPSW, which exploits the benefit of the polynomial interpolation prediction of mobile nodes positions. This scheme can deliver the message faster with appropriate opportunities. Specifically, in wait phase, relay can forward message to another one moving closer to destination, instead of waiting to encounter the destination itself...
In this paper, we propose a node's call-for-assistant protocol, named an event-driven mobile assistant protocol (EDMAP for short), with which when a node N is going to exhaust its energy, it calls for mobile nodes to help it to relay packets so the tasks of sensing environment or environment change and relay packets for upstream nodes can be proceeded. Experimental results show that this approach...
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